[Xen-changelog] [xen-4.2-testing] libxl: fix vfb related assertion problem when starting pv-domU

[Xen patchbot-4.2-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Ronny Hegewald <ronny.hegewald@xxxxxxxxx>
# Date 1355409044 0
# Node ID bfdbf9747fc4eb8f76dea0b881ae1c4acc6da3a8
# Parent  02140822d8335b3d1c7fe8cfc64c777dfec863ea
libxl: fix vfb related assertion problem when starting pv-domU

When a config-file for a pv-domU has a vfb section with a vnc=0
option then a "xl create" for that domU crashes with the message

xl: libxl.c:252: libxl_defbool_val: Assertion `!libxl_defbool_is_default(db)'
failed.

and the domU hangs early in the start.

This patch fixes the cause of the assertion and let the domU start
normally.

This problem exists since xen 4.2.

Signed-off-by: Ronny Hegewald <Ronny.Hegewald@xxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

xen-unstable changeset: 26145:8b93ac0c93f3
Backport-requested-by: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Committed-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---


diff -r 02140822d833 -r bfdbf9747fc4 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c       Wed Dec 12 11:19:40 2012 +0100
+++ b/tools/libxl/libxl.c       Thu Dec 13 14:30:44 2012 +0000
@@ -3017,6 +3017,8 @@ int libxl__device_vfb_setdefault(libxl__
         }
 
         libxl_defbool_setdefault(&vfb->vnc.findunused, true);
+    } else {
+        libxl_defbool_setdefault(&vfb->vnc.findunused, false);
     }
 
     libxl_defbool_setdefault(&vfb->sdl.enable, false);

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